Asian Projects ========== Underground depth levels for continental / country and state - transit levels should begin 7000 ft underground to depth level of 600 ft giving protective zone from solar flair or nuclear power plant accidents , the surface station areas. what countries have a problem with depth levels - ?? what are the alternatives. ? the number transit systems that must be under ground and to the depth not to interfere with other underground structures ?
Posted on: Mon, 02 Sep 2013 15:18:54 +0000